Cheapest return flights from Seattle to Sydney in August from 669€

AirHint found the following cheapest return flights from Seattle (SEA) to Sydney (SYD) in August 2025 (see full year).

Return flights

08 Aug - 21 Aug Air Canada
13 Aug - 26 Aug Qantas
24 Aug - 04 Sep Delta
05 Aug - 12 Aug Alaska Airlines
18 Aug - 25 Aug United
22 Aug - 04 Sep Alaska Airlines
22 Aug - 27 Aug Alaska Airlines
25 Aug - 03 Sep Hawaiian Airlines
25 Aug - 22 Sep Air Canada

Also check the deals for one-way flights from Seattle to Sydney in August.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

Book a cheap hotel in Sydney

Cheap car rent in Sydney

Feel free to contact us with any feedback or request another flight research.